XnView Software

Hi, i hope somebody can help me...i read the forum, but i don't found the solution...
There is my code:

string pdf_file = "C:\\test.pdf";
string imagePath = "C:\\TMP\\result.jpg";

GflAx.GflAx oGflAx = new GflAx.GflAx();
oGflAx.EpsDpi = 150;
oGflAx.LoadBitmap(pdf_file);
oGflAx.SaveJPEGQuality ...